rust/src/test/run-pass-fulldeps/proc-macro/issue-42708.rs

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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// aux-build:issue-42708.rs
// ignore-stage1
rustc: Tweak custom attribute capabilities This commit starts to lay some groundwork for the stabilization of custom attribute invocations and general procedural macros. It applies a number of changes discussed on [internals] as well as a [recent issue][issue], namely: * The path used to specify a custom attribute must be of length one and cannot be a global path. This'll help future-proof us against any ambiguities and give us more time to settle the precise syntax. In the meantime though a bare identifier can be used and imported to invoke a custom attribute macro. A new feature gate, `proc_macro_path_invoc`, was added to gate multi-segment paths and absolute paths. * The set of items which can be annotated by a custom procedural attribute has been restricted. Statements, expressions, and modules are disallowed behind two new feature gates: `proc_macro_expr` and `proc_macro_mod`. * The input to procedural macro attributes has been restricted and adjusted. Today an invocation like `#[foo(bar)]` will receive `(bar)` as the input token stream, but after this PR it will only receive `bar` (the delimiters were removed). Invocations like `#[foo]` are still allowed and will be invoked in the same way as `#[foo()]`. This is a **breaking change** for all nightly users as the syntax coming in to procedural macros will be tweaked slightly. * Procedural macros (`foo!()` style) can only be expanded to item-like items by default. A separate feature gate, `proc_macro_non_items`, is required to expand to items like expressions, statements, etc. Closes #50038 [internals]: https://internals.rust-lang.org/t/help-stabilize-a-subset-of-macros-2-0/7252 [issue]: https://github.com/rust-lang/rust/issues/50038
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#![feature(decl_macro, proc_macro, proc_macro_path_invoc)]
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#![allow(unused)]
extern crate issue_42708;
macro m() {
#[derive(issue_42708::Test)]
struct S { x: () }
#[issue_42708::attr_test]
struct S2 { x: () }
#[derive(Clone)]
struct S3 { x: () }
fn g(s: S, s2: S2, s3: S3) {
(s.x, s2.x, s3.x);
}
}
m!();
fn main() {}